title: How active are people with stroke?: use of accelerometers to assess physical activity.
abstract: OBJECTIVE
  Accelerometers are a unique tool used to objectively measure free-living physical activity, but their reliability for people with stroke has not been established. The primary aim was to assess the day-to-day reliability of these instruments for the paretic and nonparetic hips. The secondary aims were to measure the amount of physical activity with accelerometers that people with stroke undertake in the community and its relationship with walking capacity (6-minute walk test distance).
  
  
  METHODS
  Forty people with stroke wore one Actical accelerometer on each hip for 3 consecutive days at home and during the 6-minute walk test in the laboratory. The accelerometer measured physical activity using total activity counts per day and energy expenditure (kcal/d).
  
  
  RESULTS
  Excellent intraclass correlation coefficients (ICCs) for the activity counts (paretic hip ICC([1,3])=0.95, nonparetic hip ICC([1,3])=0.94) and for the energy expenditure (paretic hip ICC([1,3])=0.95, nonparetic hip ICC([1,3])=0.95) were found across the 3 consecutive days at home. Excellent ICCs were also found between the paretic versus the nonparetic hips for the activity counts (ICC([1,3])=0.98) and for the energy expenditure (ICC([1,3])=0.96). Free-living physical activity was very low and 58% of the participants did not meet recommended physical activity levels. Only moderate correlations (r=0.6 to 0.73, P<0.001) were found between the 6-minute walk test distance in the laboratory and 3-day physical activity recording at home.
  
  
  CONCLUSIONS
  The accelerometer was found to be a reliable objective instrument. The use of accelerometers quantified the low level of free-living physical activity of people with stroke.
authors.affiliation: PT/OT, Department of Physical Therapy, University of British Columbia, T325 - 2211 Westbrook Mall, Vancouver, BC, V6T 2B5, Canada.
authors.forename: Debbie
authors.initials: D
authors.lastname: Rand
authors.forename: Janice J
authors.initials: JJ
authors.lastname: Eng
authors.forename: Pei-Fang
authors.initials: PF
authors.lastname: Tang
authors.forename: Jiann-Shing
authors.initials: JS
authors.lastname: Jeng
authors.forename: Chihya
authors.initials: C
authors.lastname: Hung
mesh_terms: D000054:Acceleration; D000203:Activities of Daily Living; D000368:Aged; D000369:Aged, 80 and over; D004185:Disability Evaluation; D017079:Exercise Tolerance / Q000502:physiology*; D005260:Female; D020233:Gait Disorders, Neurologic / Q000175:diagnosis / Q000209:etiology / Q000503:physiopathology; D006801:Humans; D007866:Leg / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D010291:Paresis / Q000175:diagnosis / Q000209:etiology / Q000503:physiopathology; D010809:Physical Fitness / Q000502:physiology*; D011237:Predictive Value of Tests; D020127:Recovery of Function / Q000502:physiology*; D020521:Stroke / Q000503:physiopathology; D000071939:Stroke Rehabilitation; D016138:Walking / Q000502:physiology